Standard Guide for Petrographic Examination of Aggregates for Concrete

Standard Guide for Petrographic Examination of Aggregates for Concrete1 1. Scope* 1.1 This guide outlines procedures for the petrographicexamination of samples representative of materials proposedfor use as aggregates in cementitious mixtures or as rawmaterials for use in production of such aggregates.This guideis based on Ref (1).2 1.2 This guide outlines the extent to which petrographictechniques should be used.the selection of properties thatshould be looked for, and the manner in which such techniquesmay be employed in the examination of samples of aggregatesfor concrete. 1.3 The rock and mineral names given in DescriptiveNomenclature C294 should be used,insofar as they areappropriate, in reports prepared in accordance with this guide. 1.4The values stated in either Sl units or inch-pound unitsare to be regarded separately as standard.The values stated ineach system may not be exact equivalents; therefore,eachsystem shall be used independently of the other. Combiningvalues from the two systems may result in non-conformancewith the standard. 1.5 This standard does nor purport to address all of thesafety concerns，if any, associated with its use. It is theresponsibility of the user of this standard to establish appro- priate safety，health， and errvironmental practices and deter-nine the applicabiliry of regulatory limitations prior to use. 1.6 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards，Guides and Recom-mendations issed by the World Trade Organization TechnicalBarriers to Trade (TBT)Comnittee.